Synthesis and microwave absorption characteristics of polyaniline/NiZn ferrite composites in 2–40 GHz

NiZn ferrite coated with polyaniline, forming a composite structure, were synthesized by in situ polymerization at different aniline/NiZn ferrite weight ratio (Ani/NiZn ferrite = 1/1, 2/1, 3/1) and introduced into epoxy resin to be a microwave absorber. The spectroscopic characterizations of the formation processes of polyaniline/NiZn ferrite composites were studied using Fourier transform infrared, ultraviolet–visible spectrophotometer, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and electron spin resonance. Microwave absorbing performances were investigated by reflectivity in 2–18 and 18–40 GHz using arch method. The results showed that a wider absorption frequency range could be obtained by adding different polyaniline content in NiZn ferrite.